“It was a dark room. The doors were reinforced in a way that nobody could break in or out. You didn’t need to soundproof it,” one official said. The other official added: “You’re not going to hear someone screaming down there.”

According to the two Iraqi officials, who spoke to the Post on condition of anonymity, the dictator's henchmen from the notorious Mukhabarat (Iraqi Intelligence Service), would hold Iraqis living in the US for up to 15 days to use them as leverage.

The permanent mission of the republic of Iraq to the United Nations in New YorkCredit:
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A lack of cooperation could mean being executed and shipped back to Baghdad in diplomatic, Customs-exempt boxes, the report stated. "This is diplomatic – nobody has the authority to examine it or open it," one official explained.

The detention room was similar to others in Iraqi embassies around the world, including Eastern Europe and Arab countries, where evidence of torture was uncovered, the officials told the Post.

The toppling of Saddam Hussein's statue in Baghdad, 2003Credit:
Reuters

The mission, located close to the home of the city's former mayor Michael Bloomberg, was raided in 2003 following Saddam's fall from power in Iraq by federal investigators. The two men believe all evidence of wrongdoing was removed.

“US government officials came in. They took hard drives, computers. They went into vaults — they smash them open. Officially, they were running Iraq because we didn’t have a government. We got the mission back in less than a year,” the second official explained to the Post, adding that the Iraqi Secret Service was sent home for good.

In 2014, the subterranean space was converted into a kitchenette during a full renovation of the mission costing approximately $120,000 (£100,000), the Post reported.

According to the officials some of Saddam's most trusted agents were sent to the New York Mission to set up the operation.

The basement was split into three main rooms: an office, a communication centre and the detention facility, which was secured by a giant metal door with heavy steel bars across it. The skylight in the roof of the townhouse was also blacked out so the US Air Force and satellites could not see anything, they said.

During his time as president of Iraq (1979-2003) Saddam routinely jailed, tortured and executed anyone suspected of dissent.

While the true scale of the killings is impossible to calculate, according to Amnesty International, a "prison cleansing" campaign claimed 3,000 lives in 1997 alone. Some 300,000 Iraqis are thought to have disappeared during his rule.